Concentration

Question

How many milligrams of NaCl are there in 3l of 0.9%

NaCl solution? 

Answer 1

Assuming the 0.9% NaCl is mass/volume (which it usually is, as in normal saline), then you have 0.9 g NaCl/100 ml.

Since 3 L is equivalent to 3000 ml, you have the following:

0.9 g/100 ml x 3000 ml = 27 g NaCl in 3 Liters

Converting this to mg, you have 27 g x 1000 mg/g = 27,000 mg NaCl in 3 liters of the solution.